| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.22/5 | 4.52/5 |
| Vol 3-4 | 3.34/5 | 4.53/5 |
| Vol 5-6 | 2.86/5 | 4.39/5 |
| Vol 7-8 | 3.36/5 | 4.54/5 |
| Vol 9-10 | 3.36/5 | 4.49/5 |
| Vol 11-12 | 3.42/5 | 4.47/5 |
| Vol 13-14 | 3.36/5 | 4.51/5 |
| Vol 15-16 | 3.29/5 | 4.45/5 |
| Vol 17-18 | 3.62/5 | 4.52/5 |
| Vol 19-20 | 3.63/5 | 4.56/5 |
| Vol 21-22 | 3.38/5 | 4.52/5 |
| Vol 23-24 | 3.80/5 | 4.58/5 |
| Vol 25-26 | 3.48/5 | 4.44/5 |
| Vol 27-28 | 3.12/5 | 4.29/5 |
| Vol 29-30 | 3.18/5 | 4.45/5 |
| Vol 31-32 | 3.04/5 | 4.45/5 |
| Vol 33-34 | 3.14/5 | 4.38/5 |
| Vol 35-36 | 3.42/5 | 4.46/5 |
| Vol 37-38 | 3.59/5 | 4.58/5 |
| Vol 39-40 | 3.26/5 | 4.33/5 |
| Vol 41-42 | 3.38/5 | 4.47/5 |
| Vol 43 | 3.55/5 | 4.47/5 |
| Overall | 3.35/5 | 4.58/5 |